GPM IMERG Final Precipitation L3 1 month 0.1 degree x 0.1 degree V07

This dataset contains Version 07 of the Integrated Multi-satellitE Retrievals for GPM (IMERG) IMERG Level 3 "Final Run" precipitation analysis at 0.1 degree, monthly resolution. From the official GPM IMERG site at NASA GES DISC [https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGM_07/summary]: The Integrated Multi-satellitE Retrievals for GPM (IMERG) IMERG is a NASA product estimating global surface precipitation rates at a high resolution of 0.1 degree every half-hour beginning June 2000. It is part of the joint NASA/JAXA Global Precipitation Measurement (GPM) mission, using the GPM Core Observatory satellite (for June 2014 to present) and the Tropical Rainfall Measuring Mission (TRMM) satellite (for June 2000 to May 2014) as the standard to combine precipitation observations from an international constellation of satellites using advanced techniques. IMERG can be used for global-scale applications, including over regions with sparse or no reliable surface observations. The fine spatial and temporal resolution of IMERG data allows them to be accumulated to the scale of the application for increased skill. IMERG has three Runs with varying latencies in response to a range of application needs: rapid-response applications (Early Run, 4-hour latency), same/next-day applications (Late Run, 14-hour latency), and post-real-time research (Final Run, 4-month latency). While IMERG strives for consistency and accuracy, satellite estimates of precipitation are expected to have lower skill over frozen surfaces, complex terrain, and coastal zones. As well, the changing GPM satellite constellation over time may introduce artifacts that affect studies focusing on multi-year changes. This dataset contains Version 07 of the Integrated Multi-satellitE Retrievals for GPM (IMERG) IMERG Level 3 "Final Run" precipitation analysis at 0.1 degree x 0.1 degree, monthly resolution. The dataset represents the Final Run estimate of the monthly mean precipitation rate in mm/day. The dataset is produced by first computing the mean precipitation rate for the month in each grid cell from half-hourly satellite-only IMERG estimates, adjusting the satellite data field to the large-area bias of the Global Precipitation Climatology Project analysis of monthly surface precipitation gauges, then combining the adjusted satellite and the GPCC gauge analysis weighted by estimated inverse random error variance. The IMERG Monthly is considered the most reliable dataset. See the official GPM IMERG site at NASA GES DISC [https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGM_07/summary] for the complete dataset abstract and more information.

本数据集包含全球降水测量任务（Global Precipitation Measurement, GPM）集成多卫星反演产品（Integrated Multi-satellitE Retrievals for GPM, IMERG）的第7版三级“最终运行版”降水分析数据，空间分辨率为0.1度，时间分辨率为月度。数据源自NASA戈达德地球科学数据与信息服务中心（NASA GES DISC）的官方GPM IMERG页面[https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGM_07/summary]：

GPM集成多卫星反演产品（IMERG）是NASA推出的官方产品，自2000年6月起，以0.1度的高空间分辨率、每半小时一次的时间分辨率估算全球地表降水率。该产品隶属于NASA与日本宇宙航空研究开发机构（JAXA）联合实施的全球降水测量（GPM）任务，以GPM核心观测卫星（2014年6月至今）和热带降雨测量任务（Tropical Rainfall Measuring Mission, TRMM）卫星（2000年6月至2014年5月）为基准，通过先进技术融合国际卫星星座的降水观测数据。

IMERG可应用于全球尺度的研究场景，包括地表观测稀疏或无可靠地表观测的区域。其精细的时空分辨率特性允许数据被聚合至应用所需的尺度，从而提升分析精度。IMERG设有三种运行模式，以匹配不同应用场景的延迟需求：面向快速响应应用的早期运行版（延迟4小时）、面向当日/次日应用的延迟运行版（延迟14小时），以及面向事后实时研究的最终运行版（延迟4个月）。

尽管IMERG力求保障数据一致性与估算准确性，但卫星降水估算在冰冻地表、复杂地形以及海岸带区域的反演精度相对较低。此外，随时间推移发生变化的GPM卫星星座可能引入伪影，对针对多年变化的相关研究造成干扰。

本数据集为GPM IMERG第7版三级“最终运行版”降水分析数据，空间分辨率为0.1度×0.1度，时间分辨率为月度。该数据集以毫米/日为单位，呈现月度平均降水率的最终运行版估算结果。其生产流程为：首先从每半小时一期的纯卫星IMERG估算数据中，计算每个网格单元的月度平均降水率；随后将卫星数据场校正至全球降水气候学项目（Global Precipitation Climatology Project, GPCP）的月度地表降水雨量计分析的大尺度偏差；最后基于估算的逆随机误差方差进行加权，将校正后的卫星数据与GPCC雨量计分析数据进行融合。

IMERG月度数据集被认为是可靠性最高的数据集。完整的数据集摘要与更多详细信息，请参阅NASA GES DISC的官方GPM IMERG页面[https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGM_07/summary]。

搜集汇总

背景与挑战

背景概述

该数据集是GPM IMERG Final Precipitation L3 1 month 0.1 degree x 0.1 degree V07，提供了全球降水率的月度分析，分辨率为0.1度，时间范围从2000年6月到2025年10月。数据集结合了多卫星观测和地面降水测量，适用于全球尺度的应用，特别是在缺乏可靠地面观测的区域。